Wilson uses high order crossovers that require putting the mid range driver out of phase with respect to the tweeter and woofer in order to compensate for the ridiculous phase angle created near the crossover point. This destroys harmonic content of timbre, by design. Why anyone would accept this is beyond me. It must be the paint jobs.
Stevecham - with all due respect, but you obviously know very litte about speaker design, since what you have just said, is simply not true. I'm sure many AgoNers with technical expertise rised their eyebrows reading this.
There is no 'right' and 'wrong' in choosing drive units electrical polarity (polarity, not phase, since the phase of a drive unit is not constatnt, and changes at the unit's freq extremes). It all depends on filters you use, drive units you use and the distance of the respective drive units to the listener.
Ergo, you cannot say that connecting the midrange driver in opposite electrical polarity to the tweeter is 'good' or 'bad'. It all depends.